<template>
  <div>
    <h1>当前求和为：{{sum}}</h1>
    <h3>当前求和放大10倍为：{{bigSum}}</h3>
    <h3>我在{{school}}，学习{{subject}}</h3>
    <select v-model.number="n">
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
    </select>
    <button @click="increment">+</button>
    <button @click="decrement">-</button>
    <button @click="incrementOdd">当前求和为奇数再加</button>
    <button @click="incrementWait">等一等再加</button>
  </div>
</template>

<script>
  import {mapState,mapGetters} from 'vuex'
  export default {
    name:'Count',
    data(){
      return{
        n:1,  //用户选择的数字
      }
    },
    computed:{
      // 自己写计算属性
      // sum(){
      //   return this.$store.state.sum
      // },
      // school(){
      //   return this.$store.state.school
      // },
      // subject(){
      //   return this.$store.state.subject
      // },
      //借助mapState生成计算属性，从state中读取数据。（对象写法）
      //...mapState({he:'sum',xuexiao:'school',xueke:'subject'}),

       //借助mapState生成计算属性，从state中读取数据。（数组写法）
			...mapState(['sum','school','subject']),

      // bigSum(){
      //   return this.$store.getters.bigSum
      // }
      //借助mapGetters生成计算属性，从getters中读取数据。（对象写法）
			// ...mapGetters({bigSum:'bigSum'})
			
			//借助mapGetters生成计算属性，从getters中读取数据。（数组写法）
			...mapGetters(['bigSum'])
    },
    methods:{
      increment(){
				this.$store.commit('JIA',this.n)
			},
			decrement(){
				this.$store.commit('JIAN',this.n)
			},
			incrementOdd(){
        this.$store.dispatch('jiaOdd',this.n)
			},
			incrementWait(){
				this.$store.dispatch('jiaWait',this.n)
      }
    },
    mounted(){
     const x = mapState({he:'sum',xuexiao:'school',xueke:'subject'})
     console.log(x)
    }
  }
</script>

<style>
  button{
    margin-left: 5px;
  }
</style>